The WRF Single-Moment 6-Class Microphysics Scheme (WSM6) is a microphysics scheme used in the Weather Research and Forecasting (WRF) model. This study evaluates the performance of WSM6 and compares it with the PLIN scheme in simulations of an idealized storm case and a real heavy rainfall case over Korea. The WSM6 scheme includes a revised ice process treatment, which is different from the PLIN scheme in terms of ice property treatment, terminal velocity of graupel, and snow intercept parameter. The study uses an idealized thunderstorm experiment with fixed initial conditions and no other nonmicrophysical processes to systematically distinguish the intrinsic differences of the WSMMPs. The real case is a mesoscale convective system developed just south of the border between North and South Korea on 15 July 2001. The study uses NCEP/DOE reanalysis II data for initial and boundary forcing, and the Kain-Fritsch cumulus parameterization scheme for subgrid-scale precipitation processes. The results show that the WSM6 scheme produces a wider rain shaft compared to WSM3 and WSM5. In the real case run, there are no distinct differences in precipitation at lower resolutions due to the complexity in microphysics. The WSM6 experiment reveals better pattern correlation than the PLIN experiment. The study also performs sensitivity experiments to sedimentation velocity of graupel, showing that the major contribution of the components in the WSM6 scheme is due to the effect of particular ingredients of ice microphysical processes in Hong et al. (2004), rather than the differences in the sedimentation velocity for snow and graupel. The results indicate that the WSM6 scheme improves the simulated precipitation by shifting it southward toward the observation. The study concludes that the major differences in the simulated precipitation between the WSM6 and PLIN are due to the revised microphysics of Hong et al. (2004), not due to the smaller terminal velocity for graupel in the WSM6 than in the PLIN. The study also notes that the impact of complexity in microphysics due to the number of prognostic water substance on simulated convective activity is smaller than the effects due to how the each microphysical process is formulated in the same category of prognostic water substance, indicating a need for future efforts on the development of more realistic representation of microphysics.The WRF Single-Moment 6-Class Microphysics Scheme (WSM6) is a microphysics scheme used in the Weather Research and Forecasting (WRF) model. This study evaluates the performance of WSM6 and compares it with the PLIN scheme in simulations of an idealized storm case and a real heavy rainfall case over Korea. The WSM6 scheme includes a revised ice process treatment, which is different from the PLIN scheme in terms of ice property treatment, terminal velocity of graupel, and snow intercept parameter. The study uses an idealized thunderstorm experiment with fixed initial conditions and no other nonmicrophysical processes to systematically distinguish the intrinsic differences of the WSMMPs. The real case is a mesoscale convective system developed just south of the border between North and South Korea on 15 July 2001. The study uses NCEP/DOE reanalysis II data for initial and boundary forcing, and the Kain-Fritsch cumulus parameterization scheme for subgrid-scale precipitation processes. The results show that the WSM6 scheme produces a wider rain shaft compared to WSM3 and WSM5. In the real case run, there are no distinct differences in precipitation at lower resolutions due to the complexity in microphysics. The WSM6 experiment reveals better pattern correlation than the PLIN experiment. The study also performs sensitivity experiments to sedimentation velocity of graupel, showing that the major contribution of the components in the WSM6 scheme is due to the effect of particular ingredients of ice microphysical processes in Hong et al. (2004), rather than the differences in the sedimentation velocity for snow and graupel. The results indicate that the WSM6 scheme improves the simulated precipitation by shifting it southward toward the observation. The study concludes that the major differences in the simulated precipitation between the WSM6 and PLIN are due to the revised microphysics of Hong et al. (2004), not due to the smaller terminal velocity for graupel in the WSM6 than in the PLIN. The study also notes that the impact of complexity in microphysics due to the number of prognostic water substance on simulated convective activity is smaller than the effects due to how the each microphysical process is formulated in the same category of prognostic water substance, indicating a need for future efforts on the development of more realistic representation of microphysics.